Add support for automatically loading symbols for kld's on startup:
- Add a new 'kgdb_auto_load_klds()' routine which is invoked during startup that walks the list of linker files and tries to find a matching kld on disk for each non-kernel kld. If a kld file is found, then it is added as if the 'add-kld' command is invoked. One change from 'add-kld' is that this method attempts to use the 'pathname' from the linker_file structure first to try to load the file. If that fails it then looks in the kernel directory followed by the directories in the module path. - Move the kld file suffix handling into a separate routine so that it can be called standalone and to reduce duplicate code in find_kld_path(). - Cache the offsets of members of 'struct linker_file' during startup instead of computing them for each 'add-kld'. - Use GDB's target_read_string() instead of direct KVM access. - Add all resident sections from a kld by using bfd_map_over_sections() to build the section list rather than just adding symbols for ".text", ".data", ".bss", and ".rodata". - Change the 'add-kld' command to do a y/n prompt before adding the symbols when run interactively to match 'add-symbol-file'. MFC after: 1 week
This commit is contained in:
John Baldwin
parent
fea3c2c5c7
commit
5ca09def5b
@ -48,6 +48,7 @@ struct kthr {
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extern struct kthr *curkthr;
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void kgdb_add_kld_cmd(char *, int);
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void kgdb_auto_load_klds(void);
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void kgdb_target(void);
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void kgdb_trgt_fetch_registers(int);
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void kgdb_trgt_store_registers(int);
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@ -41,6 +41,16 @@ __FBSDID("$FreeBSD$");
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#include "kgdb.h"
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/*
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* TODO
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*
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* - Use 'target_read_memory()' instead of kvm_read().
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* - Hook into the solib stuff perhaps?
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*/
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/* Offsets of fields in linker_file structure. */
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static CORE_ADDR off_address, off_filename, off_pathname, off_next;
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static int
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kld_ok (char *path)
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{
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@ -52,68 +62,72 @@ kld_ok (char *path)
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}
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/*
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* Look for a matching file in the following order:
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* Look for a matching file checking for debug suffixes before the raw file:
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* - filename + ".symbols" (e.g. foo.ko.symbols)
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* - filename + ".debug" (e.g. foo.ko.debug)
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* - filename (e.g. foo.ko)
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* - dirname(kernel) + filename + ".symbols" (e.g. /boot/kernel/foo.ko.symbols)
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* - dirname(kernel) + filename + ".debug" (e.g. /boot/kernel/foo.ko.debug)
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* - dirname(kernel) + filename (e.g. /boot/kernel/foo.ko)
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* - iterate over each path in the module path looking for:
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* - dir + filename + ".symbols" (e.g. /boot/modules/foo.ko.symbols)
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* - dir + filename + ".debug" (e.g. /boot/modules/foo.ko.debug)
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* - dir + filename (e.g. /boot/modules/foo.ko)
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*/
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static const char *kld_suffixes[] = {
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".symbols",
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".debug",
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"",
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NULL
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};
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static int
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check_kld_path (char *path, size_t path_size)
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{
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const char **suffix;
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char *ep;
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ep = path + strlen(path);
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suffix = kld_suffixes;
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while (*suffix != NULL) {
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if (strlcat(path, *suffix, path_size) < path_size) {
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if (kld_ok(path))
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return (1);
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}
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/* Restore original path to remove suffix. */
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*ep = '\0';
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suffix++;
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}
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return (0);
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}
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/*
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* Try to find the path for a kld by looking in the kernel's directory and
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* in the various paths in the module path.
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*/
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static int
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find_kld_path (char *filename, char *path, size_t path_size)
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{
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CORE_ADDR module_path_addr;
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char module_path[PATH_MAX];
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char *module_path;
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char *kernel_dir, *module_dir, *cp;
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int error;
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snprintf(path, path_size, "%s.symbols", filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s.debug", filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s", filename);
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if (kld_ok(path))
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return (1);
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kernel_dir = dirname(kernel);
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if (kernel_dir != NULL) {
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snprintf(path, path_size, "%s/%s.symbols", kernel_dir,
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filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s/%s.debug", kernel_dir, filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s/%s", kernel_dir, filename);
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if (kld_ok(path))
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if (check_kld_path(path, path_size))
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return (1);
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}
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module_path_addr = kgdb_parse("linker_path");
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if (module_path_addr != 0 &&
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kvm_read(kvm, module_path_addr, module_path, sizeof(module_path)) ==
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sizeof(module_path)) {
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module_path[PATH_MAX - 1] = '\0';
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cp = module_path;
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while ((module_dir = strsep(&cp, ";")) != NULL) {
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snprintf(path, path_size, "%s/%s.symbols", module_dir,
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filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s/%s.debug", module_dir,
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filename);
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if (kld_ok(path))
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return (1);
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snprintf(path, path_size, "%s/%s", module_dir,
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filename);
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if (kld_ok(path))
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return (1);
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if (module_path_addr != 0) {
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target_read_string(module_path_addr, &module_path, PATH_MAX,
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&error);
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if (error == 0) {
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make_cleanup(xfree, module_path);
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cp = module_path;
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while ((module_dir = strsep(&cp, ";")) != NULL) {
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snprintf(path, path_size, "%s/%s", module_dir,
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filename);
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if (check_kld_path(path, path_size))
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return (1);
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}
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}
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}
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}
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return (0);
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}
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@ -150,36 +164,29 @@ read_pointer (CORE_ADDR address)
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static int
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find_kld_address (char *arg, CORE_ADDR *address)
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{
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CORE_ADDR kld, filename_addr;
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CORE_ADDR off_address, off_filename, off_next;
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char kld_filename[PATH_MAX];
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CORE_ADDR kld;
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char *kld_filename;
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char *filename;
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size_t filelen;
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int error;
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/* Compute offsets of relevant members in struct linker_file. */
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off_address = kgdb_parse("&((struct linker_file *)0)->address");
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off_filename = kgdb_parse("&((struct linker_file *)0)->filename");
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off_next = kgdb_parse("&((struct linker_file *)0)->link.tqe_next");
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if (off_address == 0 || off_filename == 0 || off_next == 0)
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return (0);
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filename = basename(arg);
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filelen = strlen(filename) + 1;
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kld = kgdb_parse("linker_files.tqh_first");
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while (kld != 0) {
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/* Try to read this linker file's filename. */
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filename_addr = read_pointer(kld + off_filename);
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if (filename_addr == 0)
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goto next_kld;
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if (kvm_read(kvm, filename_addr, kld_filename, filelen) !=
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filelen)
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target_read_string(read_pointer(kld + off_filename),
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&kld_filename, PATH_MAX, &error);
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if (error)
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goto next_kld;
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/* Compare this kld's filename against our passed in name. */
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if (kld_filename[filelen - 1] != '\0')
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goto next_kld;
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if (strcmp(kld_filename, filename) != 0)
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if (strcmp(kld_filename, filename) != 0) {
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xfree(kld_filename);
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goto next_kld;
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}
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xfree(kld_filename);
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/*
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* We found a match, use its address as the base
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@ -196,109 +203,208 @@ find_kld_address (char *arg, CORE_ADDR *address)
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return (0);
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}
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static void
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add_section(struct section_addr_info *section_addrs, int *sect_indexp,
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char *name, CORE_ADDR address)
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{
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struct add_section_info {
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struct section_addr_info *section_addrs;
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int sect_index;
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CORE_ADDR base_addr;
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int add_kld_command;
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};
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sect_index = *sect_indexp;
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section_addrs->other[sect_index].name = name;
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section_addrs->other[sect_index].addr = address;
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printf_unfiltered("\t%s_addr = %s\n", name,
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local_hex_string(address));
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sect_index++;
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*sect_indexp = sect_index;
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static void
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add_section (bfd *bfd, asection *sect, void *arg)
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{
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struct add_section_info *asi = arg;
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CORE_ADDR address;
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char *name;
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/* Ignore non-resident sections. */
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if ((bfd_get_section_flags(bfd, sect) & (SEC_ALLOC | SEC_LOAD)) == 0)
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return;
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name = xstrdup(bfd_get_section_name(bfd, sect));
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make_cleanup(xfree, name);
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address = asi->base_addr + bfd_get_section_vma(bfd, sect);
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asi->section_addrs->other[asi->sect_index].name = name;
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asi->section_addrs->other[asi->sect_index].addr = address;
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asi->section_addrs->other[asi->sect_index].sectindex = sect->index;
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if (asi->add_kld_command)
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printf_unfiltered("\t%s_addr = %s\n", name,
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local_hex_string(address));
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asi->sect_index++;
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}
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static void
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load_kld (char *path, CORE_ADDR base_addr, int from_tty, int add_kld_command)
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{
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struct add_section_info asi;
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struct cleanup *cleanup;
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bfd *bfd;
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/* Open the kld. */
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bfd = bfd_openr(path, gnutarget);
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if (bfd == NULL)
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error("\"%s\": can't open: %s", path,
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bfd_errmsg(bfd_get_error()));
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cleanup = make_cleanup_bfd_close(bfd);
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if (!bfd_check_format(bfd, bfd_object))
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error("\%s\": not an object file", path);
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/* Make sure we have a .text section. */
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if (bfd_get_section_by_name (bfd, ".text") == NULL)
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error("\"%s\": can't find text section", path);
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if (add_kld_command)
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printf_unfiltered("add symbol table from file \"%s\" at\n",
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path);
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/* Build a section table for symbol_file_add() from the bfd sections. */
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asi.section_addrs = alloc_section_addr_info(bfd_count_sections(bfd));
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cleanup = make_cleanup(xfree, asi.section_addrs);
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asi.sect_index = 0;
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asi.base_addr = base_addr;
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asi.add_kld_command = add_kld_command;
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bfd_map_over_sections(bfd, add_section, &asi);
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if (from_tty && (!query("%s", "")))
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error("Not confirmed.");
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symbol_file_add(path, from_tty, asi.section_addrs, 0,
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add_kld_command ? OBJF_USERLOADED : 0);
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do_cleanups(cleanup);
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}
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void
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kgdb_add_kld_cmd (char *arg, int from_tty)
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{
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struct section_addr_info *section_addrs;
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struct cleanup *cleanup;
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char path[PATH_MAX];
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asection *sect;
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CORE_ADDR base_addr;
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bfd *bfd;
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CORE_ADDR text_addr, data_addr, bss_addr, rodata_addr;
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int sect_count, sect_index;
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if (!find_kld_path(arg, path, sizeof(path))) {
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error("unable to locate kld");
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return;
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/* Try to open the raw path to handle absolute paths first. */
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snprintf(path, sizeof(path), "%s", arg);
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if (!check_kld_path(path, sizeof(path))) {
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/*
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* If that didn't work, look in the various possible
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* paths for the module.
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*/
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if (!find_kld_path(arg, path, sizeof(path))) {
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error("Unable to locate kld");
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return;
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}
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}
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if (!find_kld_address(arg, &base_addr)) {
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error("unable to find kld in kernel");
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error("Unable to find kld in kernel");
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return;
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}
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/* Open the kld and find the offsets of the various sections. */
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bfd = bfd_openr(path, gnutarget);
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if (bfd == NULL) {
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error("\"%s\": can't open: %s", path,
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bfd_errmsg(bfd_get_error()));
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return;
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}
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cleanup = make_cleanup_bfd_close(bfd);
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if (!bfd_check_format(bfd, bfd_object)) {
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do_cleanups(cleanup);
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error("\%s\": not an object file", path);
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return;
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}
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data_addr = bss_addr = rodata_addr = 0;
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sect = bfd_get_section_by_name (bfd, ".text");
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if (sect == NULL) {
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do_cleanups(cleanup);
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error("\"%s\": can't find text section", path);
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return;
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}
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text_addr = bfd_get_section_vma(bfd, sect);
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sect_count = 1;
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/* Save the offsets of relevant sections. */
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sect = bfd_get_section_by_name (bfd, ".data");
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if (sect != NULL) {
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data_addr = bfd_get_section_vma(bfd, sect);
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sect_count++;
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}
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sect = bfd_get_section_by_name (bfd, ".bss");
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if (sect != NULL) {
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bss_addr = bfd_get_section_vma(bfd, sect);
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sect_count++;
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}
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sect = bfd_get_section_by_name (bfd, ".rodata");
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if (sect != NULL) {
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rodata_addr = bfd_get_section_vma(bfd, sect);
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sect_count++;
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}
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do_cleanups(cleanup);
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printf_unfiltered("add symbol table from file \"%s\" at\n", path);
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/* Build a section table for symbol_file_add(). */
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section_addrs = alloc_section_addr_info(sect_count);
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cleanup = make_cleanup(xfree, section_addrs);
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sect_index = 0;
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add_section(section_addrs, §_index, ".text", base_addr + text_addr);
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if (data_addr != 0)
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add_section(section_addrs, §_index, ".data",
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base_addr + data_addr);
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if (bss_addr != 0)
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add_section(section_addrs, §_index, ".bss",
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base_addr + bss_addr);
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if (rodata_addr != 0)
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add_section(section_addrs, §_index, ".rodata",
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base_addr + rodata_addr);
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symbol_file_add(path, from_tty, section_addrs, 0, OBJF_USERLOADED);
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load_kld(path, base_addr, from_tty, 1);
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reinit_frame_cache();
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}
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static void
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dummy_cleanup (void *arg)
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{
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}
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static void
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load_single_kld (CORE_ADDR kld)
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{
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CORE_ADDR address;
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char kldpath[PATH_MAX];
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char *path, *filename;
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int errcode, path_ok;
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/* Try to read this linker file's filename. */
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target_read_string(read_pointer(kld + off_filename), &filename,
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PATH_MAX, &errcode);
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if (errcode)
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error("Unable to read kld filename");
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make_cleanup(xfree, filename);
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path_ok = 0;
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/* Try to read this linker file's pathname. */
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if (off_pathname != 0) {
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target_read_string(read_pointer(kld + off_pathname), &path,
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PATH_MAX, &errcode);
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if (errcode == 0) {
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make_cleanup(xfree, path);
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/*
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* If we have a pathname, try to load the kld
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* from there.
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*/
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strlcpy(kldpath, path, sizeof(kldpath));
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if (check_kld_path(kldpath, sizeof(kldpath)))
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path_ok = 1;
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}
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}
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/*
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* If we didn't get a pathname from the linker file path, try
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* to find this kld in the various search paths.
|
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*/
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if (!path_ok && !find_kld_path(filename, kldpath, sizeof(kldpath)))
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error("Unable to find kld file for \"%s\".", filename);
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/* Read this kld's base address and add its symbols. */
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address = read_pointer(kld + off_address);
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if (address == 0)
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error("Invalid address for kld \"%s\"", filename);
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load_kld(kldpath, address, 0, 0);
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printf_unfiltered("Loaded symbols for kld \"%s\" from \"%s\"\n",
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filename, path);
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}
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static int
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load_kld_stub (void *arg)
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{
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CORE_ADDR kld = *(CORE_ADDR *)arg;
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load_single_kld(kld);
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return (1);
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}
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void
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kgdb_auto_load_klds (void)
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{
|
||||
struct cleanup *cleanup;
|
||||
CORE_ADDR kld, kernel;
|
||||
int loaded_kld;
|
||||
|
||||
/* Compute offsets of relevant members in struct linker_file. */
|
||||
off_address = kgdb_parse("&((struct linker_file *)0)->address");
|
||||
off_filename = kgdb_parse("&((struct linker_file *)0)->filename");
|
||||
off_pathname = kgdb_parse("&((struct linker_file *)0)->pathname");
|
||||
off_next = kgdb_parse("&((struct linker_file *)0)->link.tqe_next");
|
||||
if (off_address == 0 || off_filename == 0 || off_next == 0)
|
||||
return;
|
||||
|
||||
/* Walk the list of linker files auto-loading klds. */
|
||||
cleanup = make_cleanup(dummy_cleanup, NULL);
|
||||
loaded_kld = 0;
|
||||
kld = kgdb_parse("linker_files.tqh_first");
|
||||
kernel = kgdb_parse("linker_kernel_file");
|
||||
for (kld = kgdb_parse("linker_files.tqh_first"); kld != 0;
|
||||
kld = read_pointer(kld + off_next)) {
|
||||
/* Skip the main kernel file. */
|
||||
if (kld == kernel)
|
||||
continue;
|
||||
|
||||
if (catch_errors(load_kld_stub, &kld,
|
||||
"Error while reading kld symbols:\n", RETURN_MASK_ALL))
|
||||
loaded_kld = 1;
|
||||
}
|
||||
|
||||
do_cleanups(cleanup);
|
||||
|
||||
if (loaded_kld)
|
||||
reinit_frame_cache();
|
||||
}
|
||||
|
||||
@ -239,4 +239,5 @@ kgdb_target(void)
|
||||
add_com ("add-kld", class_files, kgdb_add_kld_cmd,
|
||||
"Usage: add-kld FILE\n\
|
||||
Load the symbols from the kernel loadable module FILE.");
|
||||
kgdb_auto_load_klds();
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user